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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0836c8aca9c77054ef149c9f56413c08f5d08fd4765230fe57266bd979ccf359' 
  AND token = 'Ibx9Mi2h1Tek0sX6da5ykbofapYoonixEfZ9R+0eXEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}